[linux-2.6-block.git] / drivers / leds / leds-lm3697.c

// SPDX-License-Identifier: GPL-2.0
// TI LM3697 LED chip family driver
// Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/

#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/leds-ti-lmu-common.h>

#define LM3697_REV			0x0
#define LM3697_RESET			0x1
#define LM3697_OUTPUT_CONFIG		0x10
#define LM3697_CTRL_A_RAMP		0x11
#define LM3697_CTRL_B_RAMP		0x12
#define LM3697_CTRL_A_B_RT_RAMP		0x13
#define LM3697_CTRL_A_B_RAMP_CFG	0x14
#define LM3697_CTRL_A_B_BRT_CFG		0x16
#define LM3697_CTRL_A_FS_CURR_CFG	0x17
#define LM3697_CTRL_B_FS_CURR_CFG	0x18
#define LM3697_PWM_CFG			0x1c
#define LM3697_CTRL_A_BRT_LSB		0x20
#define LM3697_CTRL_A_BRT_MSB		0x21
#define LM3697_CTRL_B_BRT_LSB		0x22
#define LM3697_CTRL_B_BRT_MSB		0x23
#define LM3697_CTRL_ENABLE		0x24

#define LM3697_SW_RESET		BIT(0)

#define LM3697_CTRL_A_EN	BIT(0)
#define LM3697_CTRL_B_EN	BIT(1)
#define LM3697_CTRL_A_B_EN	(LM3697_CTRL_A_EN | LM3697_CTRL_B_EN)

#define LM3697_MAX_LED_STRINGS	3

#define LM3697_CONTROL_A	0
#define LM3697_CONTROL_B	1
#define LM3697_MAX_CONTROL_BANKS 2

/**
 * struct lm3697_led -
 * @hvled_strings: Array of LED strings associated with a control bank
 * @label: LED label
 * @led_dev: LED class device
 * @priv: Pointer to the device struct
 * @lmu_data: Register and setting values for common code
 * @control_bank: Control bank the LED is associated to. 0 is control bank A
 *		   1 is control bank B
 */
struct lm3697_led {
	u32 hvled_strings[LM3697_MAX_LED_STRINGS];
	char label[LED_MAX_NAME_SIZE];
	struct led_classdev led_dev;
	struct lm3697 *priv;
	struct ti_lmu_bank lmu_data;
	int control_bank;
	int enabled;
	int num_leds;
};

/**
 * struct lm3697 -
 * @enable_gpio: Hardware enable gpio
 * @regulator: LED supply regulator pointer
 * @client: Pointer to the I2C client
 * @regmap: Devices register map
 * @dev: Pointer to the devices device struct
 * @lock: Lock for reading/writing the device
 * @leds: Array of LED strings
 */
struct lm3697 {
	struct gpio_desc *enable_gpio;
	struct regulator *regulator;
	struct i2c_client *client;
	struct regmap *regmap;
	struct device *dev;
	struct mutex lock;

	int bank_cfg;
	int num_banks;

	struct lm3697_led leds[];
};

static const struct reg_default lm3697_reg_defs[] = {
	{LM3697_OUTPUT_CONFIG, 0x6},
	{LM3697_CTRL_A_RAMP, 0x0},
	{LM3697_CTRL_B_RAMP, 0x0},
	{LM3697_CTRL_A_B_RT_RAMP, 0x0},
	{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
	{LM3697_CTRL_A_B_BRT_CFG, 0x0},
	{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
	{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
	{LM3697_PWM_CFG, 0xc},
	{LM3697_CTRL_A_BRT_LSB, 0x0},
	{LM3697_CTRL_A_BRT_MSB, 0x0},
	{LM3697_CTRL_B_BRT_LSB, 0x0},
	{LM3697_CTRL_B_BRT_MSB, 0x0},
	{LM3697_CTRL_ENABLE, 0x0},
};

static const struct regmap_config lm3697_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = LM3697_CTRL_ENABLE,
	.reg_defaults = lm3697_reg_defs,
	.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
	.cache_type = REGCACHE_FLAT,
};

static int lm3697_brightness_set(struct led_classdev *led_cdev,
				enum led_brightness brt_val)
{
	struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
					      led_dev);
	int ctrl_en_val = (1 << led->control_bank);
	struct device *dev = led->priv->dev;
	int ret;

	mutex_lock(&led->priv->lock);

	if (brt_val == LED_OFF) {
		ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
					 ctrl_en_val, ~ctrl_en_val);
		if (ret) {
			dev_err(dev, "Cannot write ctrl register\n");
			goto brightness_out;
		}

		led->enabled = LED_OFF;
	} else {
		ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
		if (ret) {
			dev_err(dev, "Cannot write brightness\n");
			goto brightness_out;
		}

		if (!led->enabled) {
			ret = regmap_update_bits(led->priv->regmap,
						 LM3697_CTRL_ENABLE,
						 ctrl_en_val, ctrl_en_val);
			if (ret) {
				dev_err(dev, "Cannot enable the device\n");
				goto brightness_out;
			}

			led->enabled = brt_val;
		}
	}

brightness_out:
	mutex_unlock(&led->priv->lock);
	return ret;
}

static int lm3697_init(struct lm3697 *priv)
{
	struct device *dev = priv->dev;
	struct lm3697_led *led;
	int i, ret;

	if (priv->enable_gpio) {
		gpiod_direction_output(priv->enable_gpio, 1);
	} else {
		ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
		if (ret) {
			dev_err(dev, "Cannot reset the device\n");
			goto out;
		}
	}

	ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
	if (ret) {
		dev_err(dev, "Cannot write ctrl enable\n");
		goto out;
	}

	ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
	if (ret)
		dev_err(dev, "Cannot write OUTPUT config\n");

	for (i = 0; i < priv->num_banks; i++) {
		led = &priv->leds[i];
		ret = ti_lmu_common_set_ramp(&led->lmu_data);
		if (ret)
			dev_err(dev, "Setting the ramp rate failed\n");
	}
out:
	return ret;
}

static int lm3697_probe_dt(struct lm3697 *priv)
{
	struct fwnode_handle *child = NULL;
	struct device *dev = priv->dev;
	struct lm3697_led *led;
	int ret = -EINVAL;
	int control_bank;
	size_t i = 0;
	int j;

	priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
						    GPIOD_OUT_LOW);
	if (IS_ERR(priv->enable_gpio)) {
		ret = PTR_ERR(priv->enable_gpio);
		dev_err(dev, "Failed to get enable gpio: %d\n", ret);
		return ret;
	}

	priv->regulator = devm_regulator_get(dev, "vled");
	if (IS_ERR(priv->regulator))
		priv->regulator = NULL;

	device_for_each_child_node(dev, child) {
		struct led_init_data init_data = {};

		ret = fwnode_property_read_u32(child, "reg", &control_bank);
		if (ret) {
			dev_err(dev, "reg property missing\n");
			fwnode_handle_put(child);
			goto child_out;
		}

		if (control_bank > LM3697_CONTROL_B) {
			dev_err(dev, "reg property is invalid\n");
			ret = -EINVAL;
			fwnode_handle_put(child);
			goto child_out;
		}

		led = &priv->leds[i];

		ret = ti_lmu_common_get_brt_res(dev, child, &led->lmu_data);
		if (ret)
			dev_warn(dev,
				 "brightness resolution property missing\n");

		led->control_bank = control_bank;
		led->lmu_data.regmap = priv->regmap;
		led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
						 control_bank;
		led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
						   led->control_bank * 2;
		led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
						   led->control_bank * 2;

		led->num_leds = fwnode_property_count_u32(child, "led-sources");
		if (led->num_leds > LM3697_MAX_LED_STRINGS) {
			dev_err(dev, "Too many LED strings defined\n");
			continue;
		}

		ret = fwnode_property_read_u32_array(child, "led-sources",
						    led->hvled_strings,
						    led->num_leds);
		if (ret) {
			dev_err(dev, "led-sources property missing\n");
			fwnode_handle_put(child);
			goto child_out;
		}

		for (j = 0; j < led->num_leds; j++)
			priv->bank_cfg |=
				(led->control_bank << led->hvled_strings[j]);

		ret = ti_lmu_common_get_ramp_params(dev, child, &led->lmu_data);
		if (ret)
			dev_warn(dev, "runtime-ramp properties missing\n");

		init_data.fwnode = child;
		init_data.devicename = priv->client->name;
		/* for backwards compatibility if `label` is not present */
		init_data.default_label = ":";

		led->priv = priv;
		led->led_dev.max_brightness = led->lmu_data.max_brightness;
		led->led_dev.brightness_set_blocking = lm3697_brightness_set;

		ret = devm_led_classdev_register_ext(dev, &led->led_dev,
						     &init_data);
		if (ret) {
			dev_err(dev, "led register err: %d\n", ret);
			fwnode_handle_put(child);
			goto child_out;
		}

		i++;
	}

child_out:
	return ret;
}

static int lm3697_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct lm3697 *led;
	int count;
	int ret;

	count = device_get_child_node_count(dev);
	if (!count || count > LM3697_MAX_CONTROL_BANKS) {
		dev_err(dev, "Strange device tree!");
		return -ENODEV;
	}

	led = devm_kzalloc(dev, struct_size(led, leds, count), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	mutex_init(&led->lock);
	i2c_set_clientdata(client, led);

	led->client = client;
	led->dev = dev;
	led->num_banks = count;
	led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
	if (IS_ERR(led->regmap)) {
		ret = PTR_ERR(led->regmap);
		dev_err(dev, "Failed to allocate register map: %d\n", ret);
		return ret;
	}

	ret = lm3697_probe_dt(led);
	if (ret)
		return ret;

	return lm3697_init(led);
}

static int lm3697_remove(struct i2c_client *client)
{
	struct lm3697 *led = i2c_get_clientdata(client);
	struct device *dev = &led->client->dev;
	int ret;

	ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
				 LM3697_CTRL_A_B_EN, 0);
	if (ret) {
		dev_err(dev, "Failed to disable the device\n");
		return ret;
	}

	if (led->enable_gpio)
		gpiod_direction_output(led->enable_gpio, 0);

	if (led->regulator) {
		ret = regulator_disable(led->regulator);
		if (ret)
			dev_err(dev, "Failed to disable regulator\n");
	}

	mutex_destroy(&led->lock);

	return 0;
}

static const struct i2c_device_id lm3697_id[] = {
	{ "lm3697", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm3697_id);

static const struct of_device_id of_lm3697_leds_match[] = {
	{ .compatible = "ti,lm3697", },
	{},
};
MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);

static struct i2c_driver lm3697_driver = {
	.driver = {
		.name	= "lm3697",
		.of_match_table = of_lm3697_leds_match,
	},
	.probe		= lm3697_probe,
	.remove		= lm3697_remove,
	.id_table	= lm3697_id,
};
module_i2c_driver(lm3697_driver);

MODULE_DESCRIPTION("Texas Instruments LM3697 LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
5c1d824c DM	1	// SPDX-License-Identifier: GPL-2.0
5c1d824c DM	2	// TI LM3697 LED chip family driver
c5437338	3	// Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
5c1d824c DM	4
	5	#include <linux/gpio/consumer.h>
	6	#include <linux/i2c.h>
	7	#include <linux/of.h>
	8	#include <linux/of_gpio.h>
	9	#include <linux/regulator/consumer.h>
	10	#include <linux/leds-ti-lmu-common.h>
	11
	12	#define LM3697_REV 0x0
	13	#define LM3697_RESET 0x1
	14	#define LM3697_OUTPUT_CONFIG 0x10
	15	#define LM3697_CTRL_A_RAMP 0x11
	16	#define LM3697_CTRL_B_RAMP 0x12
	17	#define LM3697_CTRL_A_B_RT_RAMP 0x13
	18	#define LM3697_CTRL_A_B_RAMP_CFG 0x14
	19	#define LM3697_CTRL_A_B_BRT_CFG 0x16
	20	#define LM3697_CTRL_A_FS_CURR_CFG 0x17
	21	#define LM3697_CTRL_B_FS_CURR_CFG 0x18
	22	#define LM3697_PWM_CFG 0x1c
	23	#define LM3697_CTRL_A_BRT_LSB 0x20
	24	#define LM3697_CTRL_A_BRT_MSB 0x21
	25	#define LM3697_CTRL_B_BRT_LSB 0x22
	26	#define LM3697_CTRL_B_BRT_MSB 0x23
	27	#define LM3697_CTRL_ENABLE 0x24
	28
	29	#define LM3697_SW_RESET BIT(0)
	30
	31	#define LM3697_CTRL_A_EN BIT(0)
	32	#define LM3697_CTRL_B_EN BIT(1)
	33	#define LM3697_CTRL_A_B_EN (LM3697_CTRL_A_EN \| LM3697_CTRL_B_EN)
	34
	35	#define LM3697_MAX_LED_STRINGS 3
	36
	37	#define LM3697_CONTROL_A 0
	38	#define LM3697_CONTROL_B 1
	39	#define LM3697_MAX_CONTROL_BANKS 2
	40
	41	/**
	42	* struct lm3697_led -
	43	* @hvled_strings: Array of LED strings associated with a control bank
	44	* @label: LED label
	45	* @led_dev: LED class device
	46	* @priv: Pointer to the device struct
	47	* @lmu_data: Register and setting values for common code
	48	* @control_bank: Control bank the LED is associated to. 0 is control bank A
	49	* 1 is control bank B
	50	*/
	51	struct lm3697_led {
	52	u32 hvled_strings[LM3697_MAX_LED_STRINGS];
	53	char label[LED_MAX_NAME_SIZE];
	54	struct led_classdev led_dev;
	55	struct lm3697 *priv;
	56	struct ti_lmu_bank lmu_data;
	57	int control_bank;
	58	int enabled;
	59	int num_leds;
	60	};
	61
	62	/**
	63	* struct lm3697 -
	64	* @enable_gpio: Hardware enable gpio
	65	* @regulator: LED supply regulator pointer
	66	* @client: Pointer to the I2C client
	67	* @regmap: Devices register map
68	* @dev: Pointer to the devices device struct
69	* @lock: Lock for reading/writing the device
70	* @leds: Array of LED strings
71	*/
72	struct lm3697 {
73	struct gpio_desc *enable_gpio;
74	struct regulator *regulator;
75	struct i2c_client *client;
76	struct regmap *regmap;
77	struct device *dev;
78	struct mutex lock;
79
80	int bank_cfg;
98d278ca	81	int num_banks;
5c1d824c DM	82
	83	struct lm3697_led leds[];
	84	};
	85
	86	static const struct reg_default lm3697_reg_defs[] = {
	87	{LM3697_OUTPUT_CONFIG, 0x6},
	88	{LM3697_CTRL_A_RAMP, 0x0},
	89	{LM3697_CTRL_B_RAMP, 0x0},
	90	{LM3697_CTRL_A_B_RT_RAMP, 0x0},
	91	{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
	92	{LM3697_CTRL_A_B_BRT_CFG, 0x0},
	93	{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
	94	{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
	95	{LM3697_PWM_CFG, 0xc},
	96	{LM3697_CTRL_A_BRT_LSB, 0x0},
	97	{LM3697_CTRL_A_BRT_MSB, 0x0},
	98	{LM3697_CTRL_B_BRT_LSB, 0x0},
	99	{LM3697_CTRL_B_BRT_MSB, 0x0},
	100	{LM3697_CTRL_ENABLE, 0x0},
	101	};
	102
	103	static const struct regmap_config lm3697_regmap_config = {
	104	.reg_bits = 8,
	105	.val_bits = 8,
	106
	107	.max_register = LM3697_CTRL_ENABLE,
	108	.reg_defaults = lm3697_reg_defs,
	109	.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
	110	.cache_type = REGCACHE_FLAT,
	111	};
	112
	113	static int lm3697_brightness_set(struct led_classdev *led_cdev,
	114	enum led_brightness brt_val)
	115	{
	116	struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
	117	led_dev);
	118	int ctrl_en_val = (1 << led->control_bank);
0b9e3572	119	struct device *dev = led->priv->dev;
5c1d824c DM	120	int ret;
	121
	122	mutex_lock(&led->priv->lock);
	123
	124	if (brt_val == LED_OFF) {
	125	ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
	126	ctrl_en_val, ~ctrl_en_val);
	127	if (ret) {
0b9e3572	128	dev_err(dev, "Cannot write ctrl register\n");
5c1d824c DM	129	goto brightness_out;
	130	}
	131
	132	led->enabled = LED_OFF;
	133	} else {
	134	ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
	135	if (ret) {
0b9e3572	136	dev_err(dev, "Cannot write brightness\n");
5c1d824c DM	137	goto brightness_out;
	138	}
	139
	140	if (!led->enabled) {
	141	ret = regmap_update_bits(led->priv->regmap,
	142	LM3697_CTRL_ENABLE,
	143	ctrl_en_val, ctrl_en_val);
	144	if (ret) {
0b9e3572	145	dev_err(dev, "Cannot enable the device\n");
5c1d824c DM	146	goto brightness_out;
	147	}
	148
	149	led->enabled = brt_val;
	150	}
	151	}
	152
	153	brightness_out:
	154	mutex_unlock(&led->priv->lock);
	155	return ret;
	156	}
	157
	158	static int lm3697_init(struct lm3697 *priv)
	159	{
0b9e3572	160	struct device *dev = priv->dev;
5c1d824c DM	161	struct lm3697_led *led;
	162	int i, ret;
	163
	164	if (priv->enable_gpio) {
	165	gpiod_direction_output(priv->enable_gpio, 1);
	166	} else {
	167	ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
	168	if (ret) {
0b9e3572	169	dev_err(dev, "Cannot reset the device\n");
5c1d824c DM	170	goto out;
	171	}
	172	}
	173
	174	ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
	175	if (ret) {
0b9e3572	176	dev_err(dev, "Cannot write ctrl enable\n");
5c1d824c DM	177	goto out;
	178	}
	179
	180	ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
	181	if (ret)
0b9e3572	182	dev_err(dev, "Cannot write OUTPUT config\n");
5c1d824c	183
98d278ca	184	for (i = 0; i < priv->num_banks; i++) {
5c1d824c DM	185	led = &priv->leds[i];
	186	ret = ti_lmu_common_set_ramp(&led->lmu_data);
	187	if (ret)
0b9e3572	188	dev_err(dev, "Setting the ramp rate failed\n");
5c1d824c DM	189	}
	190	out:
	191	return ret;
	192	}
	193
	194	static int lm3697_probe_dt(struct lm3697 *priv)
	195	{
	196	struct fwnode_handle *child = NULL;
0b9e3572	197	struct device *dev = priv->dev;
5c1d824c	198	struct lm3697_led *led;
0b9e3572	199	int ret = -EINVAL;
5c1d824c DM	200	int control_bank;
5c1d824c DM	201	size_t i = 0;
5c1d824c DM	202	int j;
5c1d824c DM	203
0b9e3572 MB	204	priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
0b9e3572 MB	205	GPIOD_OUT_LOW);
5c1d824c DM	206	if (IS_ERR(priv->enable_gpio)) {
5c1d824c DM	207	ret = PTR_ERR(priv->enable_gpio);
0b9e3572	208	dev_err(dev, "Failed to get enable gpio: %d\n", ret);
5c1d824c DM	209	return ret;
	210	}
	211
0b9e3572	212	priv->regulator = devm_regulator_get(dev, "vled");
5c1d824c DM	213	if (IS_ERR(priv->regulator))
	214	priv->regulator = NULL;
	215
0b9e3572	216	device_for_each_child_node(dev, child) {
3a953dc3 MB	217	struct led_init_data init_data = {};
3a953dc3 MB	218
5c1d824c DM	219	ret = fwnode_property_read_u32(child, "reg", &control_bank);
5c1d824c DM	220	if (ret) {
0b9e3572	221	dev_err(dev, "reg property missing\n");
5c1d824c DM	222	fwnode_handle_put(child);
	223	goto child_out;
	224	}
	225
	226	if (control_bank > LM3697_CONTROL_B) {
0b9e3572	227	dev_err(dev, "reg property is invalid\n");
5c1d824c DM	228	ret = -EINVAL;
	229	fwnode_handle_put(child);
	230	goto child_out;
	231	}
	232
	233	led = &priv->leds[i];
	234
0b9e3572	235	ret = ti_lmu_common_get_brt_res(dev, child, &led->lmu_data);
5c1d824c	236	if (ret)
0b9e3572 MB	237	dev_warn(dev,
0b9e3572 MB	238	"brightness resolution property missing\n");
5c1d824c DM	239
	240	led->control_bank = control_bank;
	241	led->lmu_data.regmap = priv->regmap;
	242	led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
	243	control_bank;
	244	led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
	245	led->control_bank * 2;
	246	led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
	247	led->control_bank * 2;
	248
246eab59	249	led->num_leds = fwnode_property_count_u32(child, "led-sources");
5c1d824c	250	if (led->num_leds > LM3697_MAX_LED_STRINGS) {
0b9e3572	251	dev_err(dev, "Too many LED strings defined\n");
5c1d824c DM	252	continue;
	253	}
	254
	255	ret = fwnode_property_read_u32_array(child, "led-sources",
	256	led->hvled_strings,
	257	led->num_leds);
	258	if (ret) {
0b9e3572	259	dev_err(dev, "led-sources property missing\n");
5c1d824c DM	260	fwnode_handle_put(child);
	261	goto child_out;
	262	}
	263
	264	for (j = 0; j < led->num_leds; j++)
	265	priv->bank_cfg \|=
	266	(led->control_bank << led->hvled_strings[j]);
	267
0b9e3572	268	ret = ti_lmu_common_get_ramp_params(dev, child, &led->lmu_data);
5c1d824c	269	if (ret)
0b9e3572	270	dev_warn(dev, "runtime-ramp properties missing\n");
5c1d824c	271
3a953dc3 MB	272	init_data.fwnode = child;
	273	init_data.devicename = priv->client->name;
	274	/* for backwards compatibility if `label` is not present */
	275	init_data.default_label = ":";
5c1d824c DM	276
5c1d824c DM	277	led->priv = priv;
5c1d824c DM	278	led->led_dev.max_brightness = led->lmu_data.max_brightness;
	279	led->led_dev.brightness_set_blocking = lm3697_brightness_set;
	280
0b9e3572	281	ret = devm_led_classdev_register_ext(dev, &led->led_dev,
3a953dc3	282	&init_data);
5c1d824c	283	if (ret) {
0b9e3572	284	dev_err(dev, "led register err: %d\n", ret);
5c1d824c DM	285	fwnode_handle_put(child);
	286	goto child_out;
	287	}
	288
	289	i++;
	290	}
	291
	292	child_out:
	293	return ret;
	294	}
	295
	296	static int lm3697_probe(struct i2c_client *client,
	297	const struct i2c_device_id *id)
	298	{
0b9e3572	299	struct device *dev = &client->dev;
5c1d824c DM	300	struct lm3697 *led;
	301	int count;
	302	int ret;
	303
0b9e3572	304	count = device_get_child_node_count(dev);
98d278ca GD	305	if (!count \|\| count > LM3697_MAX_CONTROL_BANKS) {
98d278ca GD	306	dev_err(dev, "Strange device tree!");
5c1d824c DM	307	return -ENODEV;
	308	}
	309
0b9e3572	310	led = devm_kzalloc(dev, struct_size(led, leds, count), GFP_KERNEL);
5c1d824c DM	311	if (!led)
	312	return -ENOMEM;
	313
	314	mutex_init(&led->lock);
	315	i2c_set_clientdata(client, led);
	316
	317	led->client = client;
0b9e3572	318	led->dev = dev;
98d278ca	319	led->num_banks = count;
5c1d824c DM	320	led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
	321	if (IS_ERR(led->regmap)) {
	322	ret = PTR_ERR(led->regmap);
0b9e3572	323	dev_err(dev, "Failed to allocate register map: %d\n", ret);
5c1d824c DM	324	return ret;
	325	}
	326
	327	ret = lm3697_probe_dt(led);
	328	if (ret)
	329	return ret;
	330
	331	return lm3697_init(led);
	332	}
	333
	334	static int lm3697_remove(struct i2c_client *client)
	335	{
	336	struct lm3697 *led = i2c_get_clientdata(client);
0b9e3572	337	struct device *dev = &led->client->dev;
5c1d824c DM	338	int ret;
	339
	340	ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
	341	LM3697_CTRL_A_B_EN, 0);
	342	if (ret) {
0b9e3572	343	dev_err(dev, "Failed to disable the device\n");
5c1d824c DM	344	return ret;
	345	}
	346
	347	if (led->enable_gpio)
	348	gpiod_direction_output(led->enable_gpio, 0);
	349
	350	if (led->regulator) {
	351	ret = regulator_disable(led->regulator);
	352	if (ret)
0b9e3572	353	dev_err(dev, "Failed to disable regulator\n");
5c1d824c DM	354	}
	355
	356	mutex_destroy(&led->lock);
	357
	358	return 0;
	359	}
	360
	361	static const struct i2c_device_id lm3697_id[] = {
	362	{ "lm3697", 0 },
	363	{ }
	364	};
	365	MODULE_DEVICE_TABLE(i2c, lm3697_id);
	366
	367	static const struct of_device_id of_lm3697_leds_match[] = {
	368	{ .compatible = "ti,lm3697", },
	369	{},
	370	};
	371	MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);
	372
	373	static struct i2c_driver lm3697_driver = {
	374	.driver = {
	375	.name = "lm3697",
	376	.of_match_table = of_lm3697_leds_match,
	377	},
	378	.probe = lm3697_probe,
	379	.remove = lm3697_remove,
	380	.id_table = lm3697_id,
	381	};
	382	module_i2c_driver(lm3697_driver);
	383
	384	MODULE_DESCRIPTION("Texas Instruments LM3697 LED driver");
	385	MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
	386	MODULE_LICENSE("GPL v2");